@article{d1671e099fe74d05aec35677e8b73839,
title = "The effect of ultrafine-grained microstructure on creep behaviour of 9% Cr steel",
abstract = "The effect of ultrafine-grained size on creep behaviour was investigated in P92 steel. Ultrafine-grained steel was prepared by one revolution of high-pressure torsion at room temperature. Creep tensile tests were performed at 873 K under the initially-applied stress range between 50 and 160 MPa. The microstructure was investigated using transmission electron microscopy and scanning electron microscopy equipped with an electron-back scatter detector. It was found that ultrafine-grained steel exhibits significantly faster minimum creep rates, and there was a decrease in the value of the stress exponent in comparison with coarse-grained P92 steel. Creep results also showed an abrupt decrease in the creep rate over time during the primary stage. The abrupt deceleration of the creep rate during the primary stage was shifted, with decreasing applied stress with longer creep times. The change in the decline of the creep rate during the primary stage was probably related to the enhanced precipitation of the Laves phase in the ultrafine-grained microstructure.",
author = "Petr Kral and Jiri Dvorak and Vaclav Sklenicka and Takahiro Masuda and Zenji Horita and Kveta Kucharova and Marie Kvapilova and Marie Svobodova",
note = "Funding Information: The financial support for this work was provided by the Czech Science Foundation under project No. 16-09518S. This work was also supported by a Grant-in-Aid from MEXT, Japan, for Scientific Research (S) (No. 26220909). The HPT process was carried out at the International Research Centre on Giant Straining for Advanced Materials (IRC-GSAM) at Kyushu University, Fukuoka, Japan This research was funded by the Czech Science Foundation [No. 16-09518S] and Grant-in-Aid from MEXT, Japan, for Scientific Research [No. 26220909]. Funding Information: Acknowledgments: The financial support for this work was provided by the Czech Science Foundation under project No. 16-09518S. This work was also supported by a Grant-in-Aid from MEXT, Japan, for Scientific Research (S) (No. 26220909). The HPT process was carried out at the International Research Centre on Giant Straining for Advanced Materials (IRC-GSAM) at Kyushu University, Fukuoka, Japan. Publisher Copyright: {\textcopyright} 2018 by the authors.",
year = "2018",
month = may,
day = "12",
doi = "10.3390/ma11050787",
language = "English",
volume = "11",
journal = "Materials",
issn = "1996-1944",
publisher = "MDPI AG",
number = "5",
}